Electric motor



(No Model.)

W. A. OROWDUS. ELECTRIC MOTOR.

UNITED STATES PATENT OFFICE.

\VALTER A. OROIVDUS, OF CHICAGO, ILLINOIS.

ELECTRIC MOTOR.

SPECIFICATION forming part of Letters Patent No. 511,758, dated January2, 1894.

Application filed October 11, 1892- Serial No 44 (N model To aZZ whom it17mg concern; D, is the field coil whereby magnetism of Be it known thatI, WALTER A. GEOWDUS, the field magnets 13, B, is obtained. Field of thecity of Chicago, in the county of Cook coil D is a compound wound coil,as it is and State of Illinois, have invented a certain termed in theart, but no invention is claimed new and useful Improvement in ElectricM0- by me in such winding.

tors, of which the following, when taken in E, is a switch pivoted onpost 2, adapted to connection with the drawings accompanying be turnedon such post a so as to be brought and forming a part hereof, is a fulland cominto electrical contact, respectively, wit posts pletedescription, sufiicient to enable those F,F, F, F and F". Switch E is inelectrixo skilled in the art to understand, make, and cal connectionwith post 6, and post e is elecuse the same. trio-ally connected withone of the binding The object of my invention is to obtain an posts a,a. \Vheu the switch E is in elecelectric motor which can be constructedat trical contact with post F as indicated by the small cost, having fewparts readily secured dotted lines in Fig. 3, the line circuit is 15together, and a motor which can be used when broken and the motor is atrest. The several placed in more than one position to actuate posts E, FF", F", are, respectively, condiiterent kinds of machines or machinery,as nected with field coil D, in the ordinary mana fan sewing machine orother devices; and ner of connecting terminals with acompound myinvention consists in the manner of conwound field coil, so that whenthe switch E is 20 structing the several parts and combining the inelectrical contact with the post F, the field same in order to build upa motor embodying magnets B, B, are magnetized, as well as the armyinventions. mature, as will be hereinafter described, and

In the drawings referred to-Figure 1 is a the motor is thereby actuatedas a straight side elevation of a motor embodying my inshunt woundmotor, and the coils of which F 25 ventions; Fig. 2, atop plan viewthereof Fig. F and F are the terminals are entirely out 3,asectionalview on line 3-3 of Fig. 1,viewed out of circuit, and when such switch Eis in in the direction indicated by the arrows; Fig. contact with post Ffield magnets B, B, are I, a sectional View on line 4at of Fig. 1, alsomagnetized to a greater extent, and the arma- Viewed in the directionindicated by the arture to a less extent and the speed of the mo- 30rows; Fig. 5, an elevation of a plate used in tor is thereby decreased.hen switch E is building up the field magnets of the motor; inelectrical contact with post F and F re- Fig. 6, an elevation of a plateused in building spectively, field magnets B, B, are magnetized up thearmature of the motor; Fig. 7, a per- [0 ayet greater extent and thearmature still spective View of a rod and the ends thereon less. Themanner in which the coil D is com 35 used in building up the motor; andFig. 8, a pound wound, is as stated by me, no part of verticalcross-sectional view of the brushmy invention, and such winding istherefore holder and brush forming a partof the motor. not fully shown.1

The same letter of reference is used to in- G, G, G, G, (Fig. 5,) areholes in plate 0. dicate a given part where more than one view II, H,are rods extending through holes G,

4 thereof is shown in the several figures of the G; and I, I, are rodsextending through holes drawings. G, G, respectively. By means of rodsH, H, A, is the base of the motor. and I, 1, plates 0 are held firmly inposition a, 0., are the binding posts forming termiin constructing fieldmagnets 13, B.

nals for the line wire of the circuit over which H, H are nuts threadedon red H, such 45 the current extends, whereby the motor is nuts beingadapted to be adjusted closely 5 actuated; and a a are the line wires ofthe against the Outer ones of the plates 0. The

, circuit. nuts H, H respectively,'are also adapted, as B, B, are thefield magnets of the motor; is fully illustrated in Figs. 1 and 3, toserve and O, is a sheet metal plate entering into as guards for thefield coil D, and do serve as 5 the construction of the field magnets B,B. such guards maintaining such field coil in too maintaining the platesin position in the field magnet, as thebase on which are mounted,respectively, journal bearings J, J, in which the armature of the motorrotates, and brushholders K, K, respectively.

L, L, are washers threaded on rods I, I, respectively, between thejournal bearings J, J, respectively, and the outer ones of the plates 0forming the field magnets B, B.

' M, M, are nuts constructed in the ordinary way adapted to beadjustably secured against the journal bearings J, J, respectively, andto thereby firmly hold in position the journal bearings J, J,brush-holders K, K, washers L, L, and L, L, and plates 0,0, 0.Brush-holders K, K, are duplicates in construction and are eachinsulated from the rod I on which they are, respectively, placed, byinsulating the material N. The armature O is wound in the ordinarymanner, and consists of a series of plates 0, 0, (Fig. 6,) having woundthereon coil 0 and is mounted on shaft 0 such shaft being rotatably heldin the journal bearings J, J, respectively. P, is the commutator of thearmature, against which commutator, the brushes contained inbrush-holders K, K, are held in electrical contact.

The construction of the brush-holder K is clearly illustrated in Fig. 8of the drawings,

. and consists of the tube Q, having adjustable plug Q at the outer endthereof, brushes Q and Q at the inner end thereof, and spring Q abuttingagainst the adjustable plug Q at one end, and the inner end of thebrushes Q Q respectively, at the other end, such spring Q beingcontained within the tube Q and an abutment Q within which abutment isplaced the insulating material N having the circular hole 17. therein,through which the rod I extends, as hereinbefore described.

In securing the brush-holder K in place on the rod I, as hereinbeforedescribed, and by the tightening of the nuts M, M, respectively, theholder is held rigidlyin position, and the brushes Q Q are forcedagainst the commutator J by the adjusting of the plug Q against thespring Q. As will be observed by inspection of Fig. 8, thecommutatonbrushes Q Q consists of a pencil, preferably of some metal,divided by a horizontal cut into two half pencils, the purpose being toobviate as much as possible the liability to breakage'of electricalcontact of the brushes with the commutator in the operation of themachine.

In a motor, constructed as herein described, such motor can be used,when standing, on the base A, as illustrated in Fig. 1, or such motorcan be placed upon the sides thereof corresponding with the sideslettered R, R, of plate 0, or upon the end of the motor gprmec} by theend B of the plate 0. (See ig. 5. Having thus described my invention,what I claim as new, and desire to secure by Letters Patent, is'

1. In an electric motor, a field magnet consisting of sheet metal platesextending in parallel planes, a field coil extending around the plates,holes in the plates adapted to have bolts extended therethrough, boltsextending through the holes and a nut adapted to fit on each end of therespective bolts and hold the plates together, and at the same time,form a guard for the field coil; substantially as der scribed.

2. In an electric motor, the combinatiouof a field magnet having boltholes therethrough, brush holders consisting respectively, of a barrelhaving an abutment thereon, with a hole extending through such abutment,bolts extending, respectively through the holes in the field magnet andalso through the hole in the abutment of the brush holders,respectively, and insulating material interposed between the brushholders, respectively and the bolts attaching them to" the field magnet;whereby the brush holders are, respectively rigidly secured in positionand to the field magnets; substantially as described.

3. In an electric motor, the combination of field magnets constructed ofsheet metal plates,eachthereofhavingholestherethrough, bolts adapted toextend through the respective holes, nuts fitting on each end of thelower two of such bolts, and holding the plates in position, and alsoforming guards for the field coil, bolts extending through the upper twoof the holes in the plates, commutator brush-holders, one thereofmounted on each one of the last named bolts at the end thereof adjacentto the commutator of the armature, journal bearings wherein the armatureshaft is rotatably mounted, placed, respectively, on the ends of suchbolts, and nuts on the bolts adapted to be adjustably fitted against thejournal bearings, whereby the journal bearing, commutator brush-holdersand the plates forming the field magnet, are firmly secured together;substantially as described.

4. In an electric motor, the combination of field magnets constructed ofsheet metal plates each thereof having holes therethrough, bolts adaptedto extend through the respective holes, nuts fitting on each end of thelower two of such bolts, and holding the plates in position, and alsoforming guards for the field coil, bolts extending through the upper twoof the holes in the plates, commutator brush-holders one thereof mountedon each one of the last named bolts at the end thereof, adjacent tothecommutator of the armature, journal bearings wherein the armatureshaft is rotatably mounted, placed, respectively, on the ends of suchbolts, and nuts on the bolts adapted to be adjustably fitted against thejournal bearings, whereby the journal bearings, commutatorbrush-holders, and the plates forming the field magnet are firmlysecured together, each of such on either end or side thereof;substantially pliates having parallel ends and sides on the asdescribed. 6 ges thereof, and such journal bearings and commutator brushholders not extending, WALTER CROWDUS' 5 when secured in position,beyond the edges Witnesses:

of the plates forming the field magnet where- CHARLES TURNER BROWN, bythe motor can be actuated, when placed FLORA L. BROWN.

